Enforce UTF‑8-encoded license files during `uv build` (#16699)
I noticed this when working on
https://github.com/astral-sh/uv/pull/16697.
[PEP 639](https://peps.python.org/pep-0639/#add-license-files-key)
expects tools to ship license texts as UTF‑8, but previously `uv build`
would quietly include any binary blob listed under
`project.license-files`.
I have no clue what is going on with `rustfmt` for this file, but it
seems that when I add the check, it wants to reformat a bunch of
surrounding stuff.
The relevant part to look at is:
```rust
for license_file in &license_files {
let file_path = root.join(license_file);
let bytes = fs_err::read(&file_path)?;
if str::from_utf8(&bytes).is_err() {
return Err(ValidationError::LicenseFileNotUtf8(license_file.clone()).into());
}
}
```
where we validate all collected license files before proceeding.
---------
Co-authored-by: konstin <konstin@mailbox.org>
